US8155595B2 - Method for iterative interference cancellation for co-channel multi-carrier and narrowband systems - Google Patents
Method for iterative interference cancellation for co-channel multi-carrier and narrowband systems Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
- H04J11/004—Interference mitigation or co-ordination of multi-user interference at the receiver using regenerative subtractive interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0066—Interference mitigation or co-ordination of narrowband interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0212—Channel estimation of impulse response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Abstract
Description
where Ptx is the total transmitted power per symbol, N is the number of subcarriers used in the signal, k is the subcarrier index, Ncp is the length of the cyclic prefix (CP), and X(k) is the data modulated on the kth subcarrier. The received time-domain OFDMA signal that traverses through a L-tap multipath channel to arrive at the primary receiver is given by:
where Erx is the received energy per symbol, h(l) is the channel coefficient for the l-th tap, and Dl is the delay of the l-th tap. Assuming that the tap delays do not exceed the length of the CP length, after a fast fourier transform (FFT) on the received time-domain OFDMA signal at
Y(k)=√{square root over (E sc)}H(k)X(k)e −j2πkD
where H(k) is channel frequency response, and Esc the average received energy per subcarrier, which depends on the number of subcarriers, N, through the relation Esc=Erx=N.
On the other hand, the narrowband signal can be modeled by:
where m is the symbol index, am denotes the data, g(n) is the pulse shaping filter, and T is the narrowband symbol duration. As s(n) arrives at the primary receiver through a multipath channel h′(n) with L′ taps, the received signal at the primary receiver is given by:
where Dl′ is the delay of the l′-th tap.
where w(n) is an additive white Gaussian noise (AWGN). In the frequency domain, the spectrum of signal r(n) is represented by R(k), given by:
where Z(k) and W(k) are the frequency domain reciprocals of z(n) and w(n) (e.g., their FFT spectra), respectively.
Initial estimate {circumflex over (z)}(n) is demodulated at
appear as additive noise in {circumflex over (z)}(n), thereby increasing. the expected number of NB demodulation errors, especially if K is small, Second, the complexity of the algorithm becomes proportional to N rather than K. However, processing of the entire band is preferable, especially because K is not always accurately known to allow the receiver to focus on the overlap band only. Moreover, subcarriers
may be affected by the sidelobes of the NB signal, and processing the whole band may therefore be effective. Computer simulations show that, when the whole band is processed rather than the overlap band only, the noise caused by the demodulation errors outside the overlap band does not lead to a noticeable increase in the NB demodulation errors even for K/N ratios as small as 2.5%. Another method that can be used for handling co-channel signals is to demodulate them jointly utilizing a maximum likelihood (ML) estimation technique. For the coexistence scenario in consideration (which is different than prior-art scenarios where ML estimation has been applied), ML estimation might be performed either in the time domain or in the frequency domain. However, the time domain requires a lesser number of computation steps and it is more desirable to perform the ML estimation in the time domain. This is due to the relationship between K and the number of NB symbols within the OFDMA symbol C, which can be written as K=(1+α)C, where α is usually greater than 0.
where y′(n) is the time domain reciprocal of Y(k) for
Claims (26)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US12/652,337 US8155595B2 (en) | 2009-03-06 | 2010-01-05 | Method for iterative interference cancellation for co-channel multi-carrier and narrowband systems |
PCT/US2010/026238 WO2010102126A1 (en) | 2009-03-06 | 2010-03-04 | A method for iterative interference cancellation for co-channel multi-carrier and narrowband systems |
JP2011553112A JP2012520022A (en) | 2009-03-06 | 2010-03-04 | Method for iterative interference cancellation for co-channel multicarrier and narrowband systems |
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US15815509P | 2009-03-06 | 2009-03-06 | |
US12/652,337 US8155595B2 (en) | 2009-03-06 | 2010-01-05 | Method for iterative interference cancellation for co-channel multi-carrier and narrowband systems |
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US8155595B2 true US8155595B2 (en) | 2012-04-10 |
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US20120115498A1 (en) * | 2010-11-08 | 2012-05-10 | Sungkyunkwan University Foundation For Corporate Collaboration | Apparatus and method for cluster based opportunistic power control in wireless communication system |
US20150043323A1 (en) * | 2013-08-09 | 2015-02-12 | Kumu Networks, Inc. | Systems and methods for non-linear digital self-interference cancellation |
US9036749B2 (en) | 2013-08-09 | 2015-05-19 | Kumu Networks, Inc. | Systems and methods for frequency independent analog self-interference cancellation |
US9054795B2 (en) | 2013-08-14 | 2015-06-09 | Kumu Networks, Inc. | Systems and methods for phase noise mitigation |
US9077421B1 (en) | 2013-12-12 | 2015-07-07 | Kumu Networks, Inc. | Systems and methods for hybrid self-interference cancellation |
US9276682B2 (en) | 2014-05-23 | 2016-03-01 | Kumu Networks, Inc. | Systems and methods for multi-rate digital self-interference cancellation |
US9520983B2 (en) | 2013-09-11 | 2016-12-13 | Kumu Networks, Inc. | Systems for delay-matched analog self-interference cancellation |
US9521023B2 (en) | 2014-10-17 | 2016-12-13 | Kumu Networks, Inc. | Systems for analog phase shifting |
US9634823B1 (en) | 2015-10-13 | 2017-04-25 | Kumu Networks, Inc. | Systems for integrated self-interference cancellation |
US9673854B2 (en) | 2015-01-29 | 2017-06-06 | Kumu Networks, Inc. | Method for pilot signal based self-inteference cancellation tuning |
US9698860B2 (en) | 2013-08-09 | 2017-07-04 | Kumu Networks, Inc. | Systems and methods for self-interference canceller tuning |
US9712312B2 (en) | 2014-03-26 | 2017-07-18 | Kumu Networks, Inc. | Systems and methods for near band interference cancellation |
US9712313B2 (en) | 2014-11-03 | 2017-07-18 | Kumu Networks, Inc. | Systems for multi-peak-filter-based analog self-interference cancellation |
US9742593B2 (en) | 2015-12-16 | 2017-08-22 | Kumu Networks, Inc. | Systems and methods for adaptively-tuned digital self-interference cancellation |
US9774405B2 (en) | 2013-12-12 | 2017-09-26 | Kumu Networks, Inc. | Systems and methods for frequency-isolated self-interference cancellation |
US9800275B2 (en) | 2015-12-16 | 2017-10-24 | Kumu Networks, Inc. | Systems and methods for out-of band-interference mitigation |
US9819325B2 (en) | 2015-12-16 | 2017-11-14 | Kumu Networks, Inc. | Time delay filters |
US9887728B2 (en) | 2011-02-03 | 2018-02-06 | The Board Of Trustees Of The Leland Stanford Junior University | Single channel full duplex wireless communications |
US9979374B2 (en) | 2016-04-25 | 2018-05-22 | Kumu Networks, Inc. | Integrated delay modules |
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US10673519B2 (en) | 2013-08-29 | 2020-06-02 | Kuma Networks, Inc. | Optically enhanced self-interference cancellation |
US9520983B2 (en) | 2013-09-11 | 2016-12-13 | Kumu Networks, Inc. | Systems for delay-matched analog self-interference cancellation |
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US9774405B2 (en) | 2013-12-12 | 2017-09-26 | Kumu Networks, Inc. | Systems and methods for frequency-isolated self-interference cancellation |
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WO2010102126A1 (en) | 2010-09-10 |
US20100226356A1 (en) | 2010-09-09 |
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